NEP Neptune75K User Manual
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NEP Neptune75K User Manual

Grid inverter
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User Manual
for Grid Inverter
Applicable models
Neptune75K
Neptune100K
Version 1.0, Release Date: 08,2023

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Summary of Contents for NEP Neptune75K

  • Page 1 User Manual for Grid Inverter Applicable models Neptune75K Neptune100K Version 1.0, Release Date: 08,2023...
  • Page 2 Table of Contents Introduction Safety & Warning Installation Communication Commissioning Normal Operation Maintenance Troubleshooting Specifications 10 Appendix...

  • Page 3: Table Of Contents

    Table of Contents 1. Introduction ………………………………………………………………………………………………………………………… 1.1 Product Description ……………………………………………………………………………………… 1.2 Front Panel Display ……………………………………………………………………………………… 1.3 LED Status Indicator Lights ……………………………………………………………………………………… 1.4 Unpacking ……………………………………………………………………………… 1.5 Inverter Circuit Diagram ……………………………………………………………………………… 1.6 Tools Required for Installation ……………………………………………………………………………… 1.7 Storage ……………………………………………………………………………………………… 1.8 Notice of Disposal ………………………………………………………………………………………………...
  • Page 4 Table of Contents 6.4 Information ………………………………………………………………………………………………………… 6.4.1 Lock screen ……………………………………………………………………………………… 6.5 Settings ………………………………………………………………………………………………………………… 6.5.1 Set Time ………………………………………………………………………………………………… 6.5.2 Set Address …………………………………………………………………………………………… 6.6 Advanced Info - Technicians Only ……………………………………………………………… 6.6.1 Alarm Message …………………………………………………………………………………… 6.6.2 Running Message ……………………………………………………………………………… 6.6.3 Version …………………………………………………………………………………………………… 6.6.4 Daily Energy …………………………………………………………………………………………...

  • Page 5: Introduction

    1. Introduction User Manual 1.1 Product Description NEP Three phase Inverters convert DC power from the photovoltaic(PV) array into alternating current(AC) power that can satisfy local loads as well as feed the power distribution grid. This manual covers the three phase inverter models listed below:...

  • Page 6: Front Panel Display

    1. Introduction User Manual 1.2 Front Panel Display Figure 1.3 Front Panel Display 1.3 LED Status Indicator Lights There are three LED status indicator lights on the front panel of the inverter. POWER LED (red) indicates the power status of the inverter. OPERATION LED (green) indicates the operation status.

  • Page 7: Unpacking

    1. Introduction User Manual 1.4 Unpacking The inverter ships with all accessories in one carton. When unpacking, please verify all the parts listed below are included: Manual Description Quantity Remarks Part # Inverter Back plate Hexagon bolt M6*12 Fastening screw Staubli Electrical Connectors AG 16 for 75K PV-KBT4-EVO 2/6I-UR...

  • Page 8: Inverter Circuit Diagram

    1. Introduction User Manual 1.5 Inverter Circuit Diagram Neptune75K n=8 Neptune100K n=10 Current DC Link Inverter Output Switch Filter Sense MPPT-1 Filter Module Relay Filter Filter-1 DC-1 Grid AC EMI Filter Filter -n Filter-10 DC-n MPPT-n Figure 1.5 Inverter Circuit Diagram 1.6 Tools Required for Installation...

  • Page 9: Storage

    Local rules in waste management shall be respected . SAVE THESE INSTRUCTIONS – This manual contains important instructions for Models Neptune75K, Neptune100K that shall be followed during installation and maintenance of the inverter.

  • Page 10: Safety & Warning

    2. Safety & Warning User Manual 2.1 Safety symbols Safety symbols used in this manual, which highlight potential safety risks and important safety information, are listed below: WARNING Symbol indicates important safety instructions, which if not correctly followed, could result in serious injury or death. NOTE Symbol indicates important safety instructions, which if not correctly followed, could result in damage to or the destruction of the inverter.

  • Page 11: Notice For Use

    2. Safety & Warning User Manual WARNING The inverter can only accept a PV array as a DC input. Using any other type of DC source could damage the inverter. 2.3 Notice for use The inverter has been constructed according to applicable safety and technical guidelines. Use the inverter in installations that meet the following requirements ONLY: 1.

  • Page 12: Installation

    3. Installation User Manual 3.1 Environmental considerations 3.1.1 Location selection for the inverter When selecting a location for the inverter, consider the following: WARNING: Risk of fire Despite careful construction, electrical devices can cause fires. Do not install the inverter in areas containing highly flammable materials or gases.

  • Page 13: Other Environmental Considerations

    3. Installation User Manual 3.1.1.1 Examples of correct and incorrect installations Direct Sun Indoor Shade Cover Shade Cover NEMA 4X Rating Direct Rain Shade Cover ≥15° Figure 3.1 Recommended Installation locations 3.1.2 Other environmental considerations 3.1.2.1 Consult technical data Consult the specifications section (section 9) for additional environmental conditions (protection rating, temperature, humidity, altitude, etc.).
  • Page 14 3. Installation User Manual ≥20in ≥20in ≥20in ≥20in Figure 3.2 Clearance distances requirement for the inverter ≥20in ≥20in ≥30in ≥40in ≥20in Figure 3.3 Distances required between inverters when multiple inverters are installed NOTE Nothing should be stored on or placed against the inverter.

  • Page 15: Product Handling

    3. Installation User Manual 3.1.2.4 Avoiding direct sunlight Installation of the inverter in a location exposed to direct sunlight should to be avoided. Direct exposure to sunlight could cause: ● Power output limitation (with a resulting decreased energy production by the system). ●...

  • Page 16: Mounting The Inverter

    3. Installation User Manual Figure 3.5 Inverter handles WARNING Due to the weight of the inverter, contusions or bone fractures could occur when incorrectly lifting and mounting the inverter. When mounting the inverter, take the weight of the inverter into consideration.

  • Page 17: Wall Mounting

    3. Installation User Manual 3.3.1 Wall mounting Refer to figure 3.3, figure 3.7 and figure 3.8 Inverter shall be mounted upright, with electrical connections downward. The steps to mount the inverter are listed below. 1. Refer to Figure 3.7, drill holes for mounting screws based on the hole diameter of bracket using a precision drill keeping the drill perpendicular to the wall.

  • Page 18: Rack Mounting

    3. Installation User Manual 3.3.2 Rack mounting The steps to mounting to the rack are listed below: 1. Select a location for the inverter With a NEMA 4X protection rating, the inverter can be installed both outdoors and indoors. When the inverter is running, the temperature of the chassis and heat sink will be higher than the ambient .
  • Page 19 3. Installation User Manual 3. Install mounting plate a. Remove the bracket and fasteners from the packaging. Mark the position for hole, drilling according to the hole positions of the bracket. Figure 3.12 Mark the position for hole b. Drill the marked holes. It is recommended to apply anti-corrosive paint at the hole for corrosion protection.
  • Page 20 3. Installation User Manual c. Align the mounting plate with the holes, Insert the combination bolt (M10X40)through the mounting plate into the hole. Secure the bracket to the metal frame firmly with the supplied fastener. Torque the nut to 25.8 ft.lbs. Figure 3.14 Combination bolt d.

  • Page 21: Electrical Connections

    3. Installation User Manual 3.4 Electrical Connections Inverter design uses PV style quick-connect terminal. The top cover don’t need be opened during DC electrical connection. The labels located on the bottom of the inverter are described below in table 3.1. All electrical connections must be in accordance with local or national standard.

  • Page 22: Grounding

    3. Installation User Manual 3.4.1 Grounding The inverter must be grounded for safety. Two methods are provided. 1. Connect the AC grounding cable. (See Section 3.4.3) 2. Connect the equipment grounding terminal on the heatsink described below. To connect the grounding terminal on the heat sink, please follow the steps below: 1.
  • Page 23 3. Installation User Manual NOTE B (insulation stripping length) is 2mm-3mm longer than A (OT cable terminal crimping area). 4. Insert the stripped wire into the OT terminal crimping area and crimp with a hydraulic crimp tool. (see Figure 3.16) NOTE After crimping the terminal to the wire, inspect the connection to ensure the terminal is solidly crimped to the wire.

  • Page 24: Connect Pv Side Of Inverter

    3. Installation User Manual 3.4.2 Connect PV side of inverter WARNING Before connecting the inverter, make sure the PV array open circuit voltage is within the limit of the inverter. Otherwise, the inverter could be damaged. WARNING DO NOT connect the PV array positive or PV array negative cable to ground. This can cause serious damage to the inverter! WARNING MAKE SURE the polarity of the PV array output conductors matches...
  • Page 25 3. Installation User Manual Figure 3.23 Connect the DC Figure 3.22 Multimeter measurement Connectors to the Inverter Traverse area（mm²） Outside diameter of Cable type Recommended cable（mm） Range value 4.0~6.0 PV Wire 5.5~9.0 (12~10AWG) (12AWG) UL 4703 Listed CAUTION If DC inputs are accidently reversely connected or inverter is faulty or not working properly, it is NOT allowed to turn off the DC switch.

  • Page 26: Connect Grid Side Of Inverter

    3. Installation User Manual 3.4.2.1 DC connection high voltage danger notice CAUTION RISK OF ELECTRIC SHOCK Do not touch an energized DC conductor. There is high voltages present when PV modules are exposed to light causing a risk of death due to an electric shock from touching a DC conductors! Only connect the DC cables from the PV module to the inverter as described in this manual.
  • Page 27 Recommended current Rated Rated output Inverter range for OCPD (A) voltage(Vac) current (Amps) Neptune75K 90.2 Neptune100K 120.3 150-175 Table 3.2 Rating of grid OCPD 3.4.3.2 Connecting the inverter to the utility grid All electrical installations must be carried out in accordance with the local standards and the National Electrical Code®...
  • Page 28 3. Installation User Manual 3.4.3.2 Wiring procedure CAUTION RISK OF ELECTRIC SHOCK. Prior to starting the wiring procedure, ensure that the three-pole circuit breaker is switched off and are LOTO. NOTE Damage or destruction of the inverter's electronic components due to moisture and dust intrusion will occur if the enclosure opening is enlarged.
  • Page 29 3. Installation User Manual Copper terminal of cable Figure 3.26 AC Terminal Connection 3. LOTO the AC breaker disconnect to ensure it does not close unexpectedly. 4. Remove the 4 screws on the inverter junction box and remove the junction box cover. Figure 3.27 Remove the junction box cover 5.

  • Page 30: Communication & Monitoring

    4. Comm. & Monitoring User Manual There are 5 communication terminals on Neptune inverter. COM1 is a 4-pin connector reserved for Neptune WiFi/Cellular datalogger. COM2 and COM3 are RS485 connection between inverters and both RJ45 and Terminal block are provided for use . COM4 and COM5 are the Ethernet connection via RJ45.
  • Page 31 4. Comm. & Monitoring User Manual Communication Board Figure 4.3 Communication Board Detail Description Location Reference Designation RS485 from the LCD board to the Ethernet module RS485 from main COM board to the Ethernet module Ethernet Port (Output) RS485 Ports (Rj45 Output) RS485 Port (Terminal Output) P4P9 RS485 Port (Terminal Output)
  • Page 32 4. Comm. & Monitoring User Manual Use the network wire stripper to strip the insulation layer off the communication cable. Using the standard wire sequence referenced in TIA/EIA 568B, separate the wires in the cable. Use a network cable tool to trim the wire. Flatten the wire in the order shown in figure 4.4. Correspondence between the cables and the stitches of plug RJ45terminal...

  • Page 33: Ethernet Communication

    4. Comm. & Monitoring User Manual 30mm Figure 4.6 Figure 4.7 c.Insert the cable through the cap nut for each port . COM2 (RS485 IN) COM3 ( RS485 OUT). d.Remove the terminal block on user interface board ( See Figure 4.5) e.
  • Page 34 1. Monitoring Platform NEP monitoring only(DHCP) Connect in daisy chain configuration see Figure 4.8. Use the SN/QR code on the board to register the system on NEP monitoring website or APP. See APP for details. Figure 4.10 2. Monitoring Platform Neptune monitoring only(Static IP) 1.
  • Page 35 4. Comm. & Monitoring User Manual 3. Modbus TCP with DHCP 1. Connect laptop directly to Ethernet module with Ethernet cable. 2. Configure laptop IP address and navigate to 10.10.100.254 via web browser. Enter username and password (admin,admin). 3. Select Work mode in left menu. Change Work mode to "Local" and Protocol type to "Modbus TCP".
  • Page 36 4. Comm. & Monitoring User Manual 5. Ethernet Module LED Indicators D1 Red LED: Indicator between module and inverter. Constantly ON indicates normal connection. Blinking indicates it is trying to connect. OFF indicates connection failed. Constantly ON but blinking sometimes indicates it is transferring data between inverter. D2 Red LED: Indicator between module and server.

  • Page 37: Commissioning

    5. Commissioning User Manual 5.1 Selecting the appropriate grid standard 5.1.1 Verifying grid standard for country of installation Neptune inverters are used worldwide and feature preset standards for operating on any grid. Although the grid standard is set at the factory, it is essential the grid standard be verified for the country of installation before commissioning.

  • Page 38: Setting A Custom Grid Standard

    5. Commissioning User Manual 3. Use the UP/DOWN keys to highlight the SELECT STANDARD option. Press enter to select. Select Standard Grid ON/OFF Figure 5.3 4. Select the grid standard for the country of installation. YES=<ENT> NO=<ESC> Standard:UL-480V-A Figure 5.4 Press the UP or DOWN key to select the standard.

  • Page 39: Preliminary Checks

    5. Commissioning User Manual 5.4 Preliminary checks WARNING High Voltage. AC and DC measurements should be made only by qualified personnel. 5.4.1 DC configuration Verify DC configuration by noting the number of panels in a string and the string voltage. 5.4.1.1 VOC and Polarity Measure VOC, and check string polarity.

  • Page 40: Ac Configuration

    5. Commissioning User Manual 5.4.1.2.1 Detection of leakage to ground Neptune inverters are transformer-less and do not have an array connection to ground. Any measurement of a fixed voltage between ground and either the positive or negative string wiring indicates a leakage (ground fault) to ground and must be corrected prior to energizing the inverter or damage to the inverter may result.

  • Page 41: Normal Operation

    6. Normal operation User Manual 6.1 Start-up procedure To start-up the inverter, it is mandatory that the steps below are followed in the exact order outlined. 1. Ensure the commissioning checks in Section 5 have been performed. 2. Switch the AC switch ON. 3.

  • Page 42: Main Menu

    6. Normal operation User Manual CAUTION Although the inverter DC disconnect switch is in the OFF position and all the LED's are OFF, operators must wait five (5) minutes after the DC power source has been disconnected before opening the inverter cabinet. DC side capacitors can take up to five (5) minutes to dissipate all stored energy.
  • Page 43 6. Normal operation User Manual Display Description Duration VPV_Total: Shows input voltage total. VPV_Total: 1000.0V 5 sec IPV_Total: +99.0A IPV_Total: Shows input current total. V_A: Shows the grid's voltage value. V_A: 345.7V 5 sec I_ A: 109.0A I_A: Shows the grid's current value. V_C: Shows the grid's voltage value.

  • Page 44: Lock Screen

    6. Normal operation User Manual 6.4.1 Lock Screen Pressing the ESC key returns to the Main Menu. Pressing the ENTER key locks (Figure 6.2(a)) or unlocks (Figure 6.2 (b)) the screen. Figure 6.2 Locks and Unlocks the Screen of LCD 6.5 Settings The following submenus are displayed when the Settings menu is selected: 1.

  • Page 45: Advanced Info - Technicians Only

    6. Normal operation User Manual 6.6 Advanced Info - Technicians Only NOTE To access to this area is for fully qualified and accredited technicians only. Enter menu “Advanced Info.” and “Advanced settings” （need password）. Select “Advanced Info.” from the Main Menu. The screen will require the password as below: YES=<ENT>...

  • Page 46: Version

    6. Normal operation User Manual 6.6.3 Version The screen shows the model version of the inverter. And the screen will show the software ver by pressing the UP and DOWN at the same time.(see Figure 6.7). Model: 08 Software Version: D20001 Figure 6.7 Model Version and Software Version 6.6.4 Daily Energy The function is for checking the energy generation for selected day.

  • Page 47: Yearly Energy

    6. Normal operation User Manual 6.6.6 Yearly Energy The function is for checking the energy generation for selected year. YES=<ENT> NO=<ESC> Select: 2019 Figure 6.12 Select year for yearly energy Press DOWN key to move the cursor to day and year, press UP key to change the digit. Press Enter after the date is fixed.

  • Page 48: Advanced Settings - Technicians Only

    6. Normal operation User Manual 6.7 Advanced Settings - Technicians Only NOTE To access to this area is for fully qualified and accredited technicians only. Please follow 6.4 to enter password to access this menu. Select Advanced Settings from the Main Menu to access the following options: 1.
  • Page 49 6. Normal operation User Manual OV-G-F1: 61-66Hz OV-G-V1: 304.8---332.6V OV-G-F1-T: 180---1000S OV-G-V1-T: 1---13S OV-G-F2: 61.8-66Hz OV-G-V2: 304.8---360.3V OV-G-V2-T: 0.12S OV-G-F2-T: 0.16---1000S UN-G-V1: 14---243.9V UN-G-F1: 50-59Hz UN-G-F1-T: 180---1000S UN-G-V1-T: 2---50S UN-G-F2: 50-57Hz UN-G-V2: 14---138.6V UN-G-V2-T: 0.16---21S UN-G-F2-T: 0.16---1000S Startup-T: 10-600S Restore-T: 10-600S Table 6.2 Setting ranges for User-Def NOTE The initial value of the User-Def standard is for reference only.

  • Page 50: Grid On/Off

    6. Normal operation User Manual 6.7.2 Grid ON/OFF This function is used to start up or stop the power generation of Neptune Three Phase Inverter (see Figure 6.18). Grid ON Grid OFF Figure 6.18 Set Grid ON/OFF Screens can be scrolled manually by pressing the UP/DOWN keys. Press the ENTER key to save the setting.

  • Page 51: Power Control

    6. Normal operation User Manual 6.7.5 Power Control Active and reactive power can be set through power setting button. There are 5 item for this sub menu: 1. Set output power 2. Set Reactive Power 3. Out_P With Restore 4. Rea_P With Restore 5.

  • Page 52: Std Mode Settings

    6. Normal operation User Manual 6.7.8 STD Mode Settings NOTE This section is applicable to maintenance personnel only. Selecting “STD Mode. Settings” displays the sub-menu shown below: 1. Working Mode Set 2. Power Rate Limit 3. Freq Derate Set 4. 10mins Voltage Set 5.
  • Page 53 6. Normal operation User Manual 1.NULL Description: Inverter is not under any working mode. 2. Volt-Watt Description: Inverter will change the active output power based on voltage change. Active Power (Generation) Active Power rated Setting Parameter Default Value Range 1.06 Un 1.05 Un-1.09 Un rated 1.1 Un...
  • Page 54 6. Normal operation User Manual 4.Fixed-PF Description: Inverter will output power with fixed power factor. Setting Range: -0.8 to +0.8 Default value is PF = 1 YES=<ENT> NO=<ESC> Power Factor:+1.00 Figure 6.23 Fixed-PF Figure 6.24 PF Range 5. Reac-power (Not Required) Description: Inverter will generate reactive power based on changing output power.
  • Page 55 6. Normal operation User Manual 7.Power-Q Description: Inverter will change reactive power based on active power output. Reactive Power Injection/Over Excited Active Power (Generation) Absorption/Under Excited Figure 6.25 Watt-Var Active Power Reactive Power Active Power Reactive Power Setting Point Range Range Default Default...
  • Page 56 6. Normal operation User Manual 6.7.8.1.2 With Rule21 Standard selected NOTE The following modes are for "R21P3-48A". Neptune US version inverters have ten working modes: 1. NULL 2. Volt-watt 3. Volt-Var 4. Fixed-PF 5. Reac-power 6. Power -PF 7. Volt-Var and Volt Watt enabled Based on Rule21, working mode 1,2,3,4 can be used by grid operator.
  • Page 57 6. Normal operation User Manual Default Settings for Rule21 Standards: Rated 480V Grid V1:less than Vstart V2: less than Vstart V3 (Vstart): (480-576V) Default 508.8V V4: (Vstop): (480-576V) Default 528V P1:100% P2:100% P3: 100% P4:0% 3. Volt-Var Description: Inverter will change the reactive output power based on voltage change. Q1,cap Q2=Q3=0 Vnom...
  • Page 58 6. Normal operation User Manual YES=<ENT> NO=<ESC> Power Factor:+1.00 Figure 6.29 Fixed-PF Figure 6.30 PF Range 5. Reac-power (Not Required) Description: Inverter will generate reactive power based on changing output power. Note: This Setting is NOT required by Rule21 Standards. NOTE This function is for maintenance personnel only, wrong operation will prevent the inverter from reaching maximum power.
  • Page 59 6. Normal operation User Manual 7. Enable both Volt-Var and Volt-Watt modes Description: Rule21 requires both Volt-var and Volt-watt modes can be enabled. To set both modes (Volt-var in high priority) Step 1: Select and set Volt-watt mode at first. Step 2: Enter "Working Mode"...
  • Page 60 6. Normal operation User Manual 6.7.8.2 Power Rate Limit This function is used for change Power Ramp-up rate. When inverter start up or input string MPPT changes, inverter power ramp-up rate is limited in this menu. The default setting is stop (disable). The setting range from 1% to 100%, means inverter power change rate per minute.
  • Page 61 6. Normal operation User Manual 6.7.8.4 10mins Voltage Set This function is disabled and not used for the US. NOTE This function is for maintenance personnel only, wrong operation will prevent the inverter from reaching maximum power. 6.7.8.5 Q3Tau Settings This function is disabled and not used for the US.

  • Page 62: Restore Settings

    6. Normal operation User Manual 6.7.8.8 Initial Settings In initial settings it will reset each work mode from 6.5.8.1 to 6.5.8.4 back to default. Work Mode Default Power Rate Default Figure 6.36 Initial Settings 6.7.8.9 Voltage PCC Set Set the voltage at the PCC point. This setting is required by RULE 21 requirements.

  • Page 63: Hmi Update

    6. Normal operation User Manual 6.7.10 HMI Updater NOTE This section is applicable to maintenance personnel only. Selecting “Updater” displays the sub-menu shown below: HMI Current Ver.: 02 YES=<ENT> NO=<ESC> Figure 6.38 Updater is for updating LCD firmware. Press the ENTER key to start the process. Press the ESC key to return to the previous menu.

  • Page 64: Debug Parameter

    6. Normal operation User Manual 6.7.13 Debug Parameter NOTE This section is applicable to maintenance personnel only. Debug Parameter as shown as below: S16DAT1: +0000 S16DAT2: +0000 S16DAT3: +0000 S16DAT4: +0000 S16DAT5: +0000 S16DAT6: +0000 S16DAT7: +0000 S16DAT8: +0000 Figure 6.40 Press the UP/DOWN keys to scroll through items.

  • Page 65: Dsp Update

    6. Normal operation User Manual 6.7.14 DSP Update The function is used for update the DSP. NOTE This function is applicable by maintenance personnel only, wrong operation will prevent the inverter from reaching maximum power. 6.7.15 Compensation Set This function is used to calibrate inverter output energy and voltage. It will not impact the energy count for inverter with RGM.

  • Page 66: I/V Curve

    6. Normal operation User Manual 6.7.16 I/V Curve This function is used to scan the I/V characteristic curves of each PV strings. Set I/V Curve I/V Curve Scan Figure 6.43 I/V Curve 6.7.16.1 Set I/V Curve This setting can set the scanning voltage start point and the voltage interval. 850V 010V Figure 6.44 Set I/V Curve...

  • Page 67: Afci Function

    6. Normal operation User Manual 6.8 AFCI function Neptune inverters have the built-in AFCI function which can detect the arc fault on the DC circuit and shut down the inverter to prevent a fire disaster. 6.8.1 Enable the AFCI function The AFCI function can be enabled in the following.

  • Page 68: Maintenance

    7. Maintenance User Manual Neptune Three Phase Inverter does not require any regular maintenance. However, cleaning the dust on heat-sink will help the inverter to dissipate the heat and increase its life time. The dust can be removed with a soft brush. CAUTION Do not touch the inverter's surface when it is operating.

  • Page 69: Fan Maintenance

    7. Maintenance User Manual NOTE If you need to maintain the inverter at night, please turn off the AC switch first, then turn off the DC switch, and wait 5 minutes before you do other operations. 7.2 Fan Maintenance If the fan does not work properly, the inverter will not be cooled effectively and it will affect inverter operation.

  • Page 70: Troubleshooting

    6. Your contact details 8.3.1 Troubleshooting guide NEP inverters are designed in accordance with international grid standards, safety standards and electromagnetic compatibility requirements. Before delivery to the customer, the inverter has been subjected to intensive testing to ensure its optimal operation and reliability.
  • Page 71 8. Troubleshooting User Manual Alarms Cause Solution Test – DC switch OFF • Check PV connections • Input voltage low/missing • Check polarity No Information • Polarity reversed • Check voltage >200V (Blank Screen) • Main board damaged Test – DC Switch ON •...
  • Page 72 8. Troubleshooting User Manual Alarms Cause Solution Test – DC switch OFF • Check frequency at the inverter test points • If Frequency measures high, adjust upper limit with permission from utility OV-G-F: Over • Inverter detects grid • Check LCD reading, may be a bad Grid Frequency Frequency as too high measurement circuit...
  • Page 73 8. Troubleshooting User Manual Alarms Cause Solution Reset Inverter • DC switch OFF INI-FAULT: • Master and Slave DSP • Wait until all lights/LCD turn off Initialization have different values • DC switch ON Protection • Replace inverter Inspect installation OV-TEM: •...

  • Page 74: Specifications

    9. Specifications User Manual Model Neptune75K 1000 Start-up voltage (Volts) 180...1000 550...850 Max. input current (Amps) 8x32 Max short circuit input current (Amps) 8x50 8/16 Rated output power (Watts) 75000 Max. output power (Watts) 75000 Max. apparent output power (VA)
  • Page 75 9. Specifications User Manual Model Neptune100K 1000 Start-up voltage (Volts) 180...1000 550...850 Max. input current (Amps) 10x32 Max short circuit input current (Amps) 10x50 10/20 Rated output power (Watts) 100000 Max. output power (Watts) 100000 Max. apparent output power (VA) 100000 Rated grid voltage (Volts) 3/PE~480...
  • Page 76 10. Appendices User Manual Torque Parts Cover screws 1.5-1.7 ft.lbs 4.4-6.0 ft.lbs Ground screws (Cover) Ground screws (Internal) 17-21 ft.lbs AC terminals 17-21 ft.lbs 10.1 Temperature Derating TEMPERATURE DERATING Neptune(75-100)K Figure 10.1 For all models of inverter Comments: A thermal sensor inside the inverter is calibrated to determine ambient temperature. All inverters will begin a sloped derate at 50°C ending at 60% output power at 60°C.
  • Page 77 10. Appendices User Manual 10.2 Input Voltage Derating INPUT VOLTAGE DERATING Neptune(75-100)K Figure 10.2 For all models of inverter 10.3 Output Voltage Derating OUTPUT VOLTAGE DERATING Neptune(75-100)K Figure 10.3 For all models of inverter...

  • Page 78: Appendix

    10. Appendices User Manual 10.4 P-Q Capabilities at Nominal Output Power Inverter is capable providing reactive power of ±60kVAR at nominal grid voltage and rated ambient temperature. Chart below details inverter reactive power capabilities at various input voltages and various ambient temperature condition. P-Q CURVE Neptune100K P-Q CURVE Neptune100K AT 0.9VN=VGRID≤1.1VN...
  • Page 79 Inverter is capable providing reactive power of ±45kVAR at nominal grid voltage and rated ambient temperature. Chart below details inverter reactive power capabilities at various input voltages and various ambient temperature condition. P-Q CURVE Neptune75K P-Q CURVE Neptune75K AT 0.9VN=VGRID≤1.1VN...
  • Page 80 10. Appendices User Manual 10.5 Default Grid Setting for UL-480-18 Parameter Range Default Description Set grid over-voltage protection 01 value L-L 528 V OV-G-V01 L-L 528-576 V OV-G-V01 L-N 304.8-332.6 V 304.8 V Set grid over-voltage protection 01 value L-N 13 S OV-G-V01-T 1-13 S...
  • Page 81 10. Appendices User Manual Parameter Range Default Description Ramp-up Set Ramp-up power slew rate during start-up 100% 1-100% Slew Rate Reconnect 0.10-100% 0.33%V Set Ramp-up power slew rate during reconnect Slew Rate 10 S Volt Watt P3Tau 0.5-60 S Set power rise time for Volt Watt condition Set reactive power rise time for Volt Var condition Volt Var Q3Tau 1-90 S...
  • Page 82 Manufacturer: Northern Electric Power Technology, Inc. Pleasanton，CA，USA Toll-free: (888) 598-9901 Email: info@northernep.com; support@northernep.com Web: https://northernep.com Please adhere to the actual products in case of any discrepancies in this user manual. Please record the serial number of your inverter and quote this when you contact us.

This manual is also suitable for:

Neptune100k

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